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本帖最后由 ljh809809 于 2015-8-17 17:18 编辑
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标准是相通的。可以参考这个 IEC60950-1:2005+A1:2009+A2:2013说得好清楚了。
$ ]8 J; \; p9 \1 S! m. }2.6.2 Functional earthing
8 A0 K! W" L% gIf FUNCTIONAL EARTHING of accessible or inaccessible conductive parts is necessary, all of the! m4 g7 A4 [; ^2 |
following apply to the FUNCTIONAL EARTHING circuit:
: ?, P" v2 d0 z" \, j; S! {− the FUNCTIONAL EARTHING circuit shall be separated from parts at HAZARDOUS VOLTAGES in! T m& _$ \! ~, G6 j) H0 S, y
the equipment by either:2 l U3 g$ D# L9 L
• DOUBLE INSULATION or REINFORCED INSULATION; or, k; K: d; b/ C6 Y
• a protectively earthed screen or another protectively earthed conductive part, separated" `6 @) u, P/ ?, i1 m
from parts at HAZARDOUS VOLTAGES by at least BASIC INSULATION; and
6 y2 Z( J; \9 r# l( F% T, ~7 B− it is permitted to connect the FUNCTIONAL EARTHING circuit to a protective earth terminal or4 m+ d7 R' M( }" J) V6 Z
to a PROTECTIVE BONDING CONDUCTOR; and* w# z' n& V! ?
− wiring terminals to be used only for FUNCTIONAL EARTHING shall not be marked by the3 k$ J& i1 e' N- i/ o5 G7 Y$ c
symbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), except that, where a
0 L/ u, Y$ F& y* x4 q& twiring terminal is provided on a component (for example, a terminal block) or! R, N# ^# q* R
subassembly, the symbol is permitted; and
- U# T5 z9 P2 O! X8 F* dNOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or
" t* F1 F& w3 |8 `(IEC 60417-5020
& Z: K& ?; r) P0 f(DB:2002-10)), if appropriate, are permitted.' v' r+ {# d, t
− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow
# q; o" E# K; A; Zshall not be used except in multipurpose preassembled components (for example, multiconductor
+ w+ V! W, H: h" m! C& }& v! mcables or EMC filters); and
# ~% @: c0 \0 ?8 P- F0 ~6 Z- wNOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or
: i/ D0 A: a# b7 m2 z6 E8 }. B(IEC 60417-5020
. y/ _' I* Y$ u0 B! D9 l(DB:2002-10)), if appropriate, are permitted.6 K" _. M, C# j% i; H0 X5 ^8 v: A3 ]7 o
− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow1 i& V9 |$ K& [% F5 W
shall not be used except in multipurpose preassembled components (for example, multiconductor
" D2 a" `: \- {; Y. l# l; A q* N ~cables or EMC filters); and. R. i$ a' C8 @( o7 Z- K' P; J
− in a power supply cord where a conductor having green-and-yellow insulation is used only
' N/ R) j" k( x7 a, e* mto provide a FUNCTIONAL EARTHING connection:
5 L) r0 c# J6 G: e• the equipment shall not be marked with the symbol (IEC 60417-5172 (DB:2003:02));) V' j3 Q: i/ }. d2 M J7 x
and
3 p! p8 \% B1 A. q& h, a• there are no requirements other than those in 3.1.9 regarding the termination of this
! p8 j4 B- |2 x, }+ `conductor at the equipment end.+ \% S A/ D9 ~$ H$ C4 L1 ]
For equipment having a power supply cord where a conductor with green-and-yellow
2 t0 \5 m! _6 j/ Y2 z3 O8 [$ t2 \insulation is used only to provide a FUNCTIONAL EARTHING connection:
$ c4 T# W- |2 Y- M% W0 n− the equipment shall not be marked with the symbol , IEC 60417-5172 (2003-02); and* j f) Z' h7 Q2 j8 d
− the equipment may be marked with:
% i; x1 V' ]7 h. I* i4 J3 r y& v3 r1 d• the symbol , IEC 60417-5018 (2011-07); or# t3 C( g+ A9 E+ O: J
• the symbol , IEC 60417-6092 (2011-10).
4 I( v5 B& _9 A7 u1 q0 NThese symbols shall not be used for CLASS I EQUIPMENT.
) O! b) \5 H0 Y. @There are no requirements other than those in 3.1.9 regarding the termination of this
& ]% w4 C0 N! N+ o: r; J+ G2 I8 [3 o. sFUNCTIONAL EARTHING conductor at the equipment end.: `9 o' g7 e g3 R
Compliance is checked by inspection.
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图片出不来,有兴趣可以看原文标准。
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